qemu: only include alsa-lib for alsa support

pkgs/applications/virtualization/qemu/default.nix

@@ -64,6 +64,7 @@ stdenv.mkDerivation rec {
     ++ lib.optionals stdenv.isDarwin [ CoreServices Cocoa Hypervisor rez setfile ]
     ++ lib.optionals seccompSupport [ libseccomp ]
     ++ lib.optionals numaSupport [ numactl ]
+    ++ lib.optionals alsaSupport [ alsa-lib ]
     ++ lib.optionals pulseSupport [ libpulseaudio ]
     ++ lib.optionals sdlSupport [ SDL2 SDL2_image ]
     ++ lib.optionals gtkSupport [ gtk3 gettext vte ]
@@ -71,7 +72,7 @@ stdenv.mkDerivation rec {
     ++ lib.optionals smartcardSupport [ libcacard ]
     ++ lib.optionals spiceSupport [ spice-protocol spice ]
     ++ lib.optionals usbredirSupport [ usbredir ]
-    ++ lib.optionals stdenv.isLinux [ alsa-lib libaio libcap_ng libcap attr ]
+    ++ lib.optionals stdenv.isLinux [ libaio libcap_ng libcap attr ]
     ++ lib.optionals xenSupport [ xen ]
     ++ lib.optionals cephSupport [ ceph ]
     ++ lib.optionals glusterfsSupport [ glusterfs libuuid ]